let qq = require('./a.js')
let ww = require('./b.js')
console.log(qq, ww)
// require module  exports  __dirname  __filename
//  __dirname  是当前文件所在文件夹的绝对目录
//  __filename 是当前文件的绝对目录
console.log('__dirname:', __dirname)
console.log('__filename:', __filename)